29. Pick up the incorrect statement from the following :

A. The C.G. of a circle is at its centre

B. The C.G. of a triangle is at the intersecton of its medians

C. The C.G. of a rectangle is at the intersection of its diagonals

D. The C.G. of a semicircle is at a distance of r/2 from the centre

30. The centre of gravity of a quadrant of a circle lies along its central radius at a distance of

A. 0.2 R

B. 0.3 R

C. OA R

D. 0.6R.

31. The C.G. of a right circular cone lies on its axis of symmetry at a height of

A. h/2

B. h/3

C. hI4

D. hI5

32. Centre of gravity of a thin hollow cone lies on the axis of symmmetry at a height of

A. one-half of the total height above base

B. one-third of the total height above base

C. one-fourth of the total height above base

D. none of these.

33. Centre of gravity of a trpezium of height h and parallel

A.

B.

C.

D.

34. The Centre of gravity of a 10 x 15 x 5 cm T section from its bottom, is

A. 7.5 cm

B. 5.0 cm

C. 8.75 cm

D. 7.85 cm

35. A square hole is punched out of a circular lamina, the diagonal of the square being the radius of the circle. If r is the radius of the circle, the C.G. of the remainder from the corner of the square on the circumference will be

A. r(rc + 0.25)

B. r(iT - 0.5)Tr -I- 0.25

C. rqc_-. 0.25)

D. rift+ 0.25J

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